64 PHYSICAL EXPRESSION. 



be analyzed ; further, all movement can be correlated 

 with other modes of force. For these reasons it is 

 urged that kinetic function, as well as trophic 

 function, should be studied in all living beings. 

 Any movement tells us something about the source 

 of the motor force, which in man is the central 

 nerve-system. The results of brain-conditions, 

 called the emotions, are expressed by movements ; 

 this may be illustrated by quotations from the 

 writings of Sir C. Bell, Bain, and Siddons, in their 

 descriptions of laughter and anger. 



Anything that indicates movement may be as 

 expressive as the movement itself. Movement in 

 the hands of a watch indicates the movement of 

 its wheels. We say that in anger a man shows his 

 teeth; we really mean that he opens his mouth 

 and moves his lips. In the expression of rage, the 

 congestion of the face results indirectly from fixa- 

 tion of the respiratory muscles. So the voice 

 results from movements, and is a mode of expression. 

 Similarly, work done is a result of movement, and 

 may be a mode of expression, whether the work 

 be mechanical or mental in kind. The gait in 

 walking indicates a man's general condition, eager- 

 ness, excitement, fatigue, etc. ; it depends upon 

 the condition of his nerve-centres, and expresses 

 this. 



A posture is the result of the last movement of 

 the part. The significance of postures is shown in 

 chap. vii. 



The subsidence of movement may be as suggestive 

 a mode of expression as its occurrence. Spontaneous 



